<template>
    <!-- 头部区域  -->
    <el-container class="home-container">
    <!--头部-->
    <el-header>
      <div>
        <img src="../assets/heima.png"/>
        <span>电商后台管理</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
          <!--主体区域-->
          <el-container>
          <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px': '200px'">
          <div class="toggle-button" @click="toggleCollapase">|||</div>
          <!-- 左侧边菜单栏 -->
          <el-menu
              background-color="#333744"
              text-color="#fff"
              active-text-color="#409eff"
              :unique-opened="true"
              :collapse="isCollapse"
              :collapse-transition="false"
              :router="true"
              :default-active="activePath">
              <!-- 一级菜单 -->
            <el-submenu :index="item.id + ''" v-for=" item in menulist" :key="item.id">
              <!-- 一级菜单模板 -->
              <template slot="title">
                <!-- 图标 -->
                <i :class="iconsObj[item.id]"></i>
                <!-- 文本 -->
                <span>{{item.authName}}</span>
              </template>
              <!-- 二级菜单 -->
              <el-menu-item :index="'/' + subItem.path + ''"
                v-for="subItem in item.children"
                :key="subItem.id"
                @click="saveNavState('/' + subItem.path + '')">
                <template slot="title">
                  <!-- 图标 -->
                  <i class="el-icon-menu"></i>
                  <!-- 文本 -->
                  <span>{{subItem.authName}}</span>
                </template>
              </el-menu-item>
            </el-submenu>
          </el-menu>
        </el-aside>
        <!-- 右侧内容 -->
        <el-main>
          <!--路由占位符-->
          <router-view/>
        </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单 数据
      menulist: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  // 生命周期函数
  created () {
    this.getMetenulist()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 定义一个从数据库获取所有菜单的函数
    async getMetenulist () {
      const { data: res } = await this.$http.get('menus')
      console.log(res)
      if (res.meta.status !== 200) return this.$message.err(res.meta.msg)
      this.menulist = res.data
    },
    // 点击切换展开
    toggleCollapase () {
      this.isCollapse = !this.isCollapse
    },
    // 保存点击后链接激活 字体高亮
    saveNavState (activePath) {
      // 创建一个键
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container{
  height: 100%;
}

.el-header{
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  // align-items; center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside{
  background-color: #333744;
  .el-menu{
    border-right: 0;
  }
}

.el-main{
  background-color: #eaedf1;
}

.iconfont {
  margin-right: 10px
}

.toggle-button{
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}

</style>
